Amcrest General 1080P(V2) Mini 1U Series, User Manual, Page: 29 / 188

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Keep connection lugs in well contact
The signal line and shielded wire should be fixed firmly and in well connection. Avoid dry joint, lap
welding, and oxidation.
3.5.2 Connecting Video Output
Video output includes a BNC(PAL/NTSC1.0V
P-P
，
75Ω
）
output, a VGA output, and a HDMI output.
System supports BNC, VGA and HDMI output at the same time.
When you are using pc-type monitor to replace the monitor, please pay attention to the following points:

To defer aging, do not allow the pc monitor to run for a long time.

Regular demagnetization will keep your device in proper working condition.

Keep it away from strong electromagnetic interference devices.
Using TV as video output device is not a reliable substitution method. You also need to reduce the
working hour and control the interference from power supply and other devices. The low quality TV may
result in device damage.
3.6 Connecting Audio Input & Output, Bidirectional Audio
3.6.1 Audio Input
These series products audio input port uses a BNC port.
Due to high impedance of audio input, please use active sound microphone.
Audio transmission is similar to video transmission. Try to avoid interference, look out for dry joint, loose
contacts, and it should be away from power lines.
3.6.2 Audio Output
The audio output signal parameter is usually over
200mv 1KΩ (BNC or RCA). It can directly connect to
low impedance earphone, active speaker or amplifier-drive audio output device.
If the speaker and the microphone cannot be separated spatially, it is easy to a feedback loop. In this
case you can adopt the following measures:

Use a better directional microphone.

Reduce the volume of the speaker.

Using more sound-absorbing materials in the surrounding area can reduce voice echo and improve
the acoustic environment.

Adjust the layout to reduce the occurance of a feedback loop.
3.7 Alarm Input and Output Connection
Please read the following before connecting any alarms.
1. Alarm input
a. Please make sure alarm input mode is grounded.
b. Grounding signal is needed for alarm input.
c. Alarm input uses a low level voltage signal.
d. Alarm input mode can be either NO (normal Open) or NC (Normal Close)
e. When you are connecting two DVRs or you are connecting one DVR and one other device, please
use a relay to separate them.
2. Alarm output